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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c868ed7378eeb4620e40f75fec015b1d0e6550c3ee4e0cb7eba4f68dee2f3965' 
  AND token = 'r4DD5+fFwfzEXxlOvVV/pmWwkQqNY4YvJUfhUrHYAd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}