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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67cf0115840ab397cccce15f9aa47a2b42ced91a8a725f894d8193aa3efac13' 
  AND token = 'wr8rG81AbW+Zx/b12vfCy9U2lWWQoelC21VHv9IY3g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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