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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b696f52dda3223f51f612dc08d3a3af003b7849d814f28fdf7c2e7c680663036' 
  AND token = 'P3HQM3Xz1QeP16Wrlc1QohnYHNElDOzTJikOINxunAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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