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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e794706864a9a09e1a095f6e9923690f8bd594f768cc924c2509d3836738e5d4' 
  AND token = 'wkvz1L+oU4vko7hih9sdaOvVLpiI3bHK8ADW5Jv7vzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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