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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7824f06e7deb5d36ce2d576efa774b7ad54a0d845040840c2a1d33683f6d903a' 
  AND token = 'tNhd4SGTAa7U9FNDxAhF1ce0aLfyQ2Kj+dDL3thx/ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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